定義:表示過去某一時間或動作以前已經發生或完成了的動作,對過去的某一點造成的某種影響或是結果,用來指在另一個過去行動之前就已經完成了的事件。
構成:主語+had+過去分詞(規則/不規則)+其他
1 肯定句:We had had dinner before they came home.
2 否定句:We had not had dinner before they came home.
3一般疑問句: Had you had dinner before they came home?
Yes,we had./No,we hadn’t.
4特殊疑問句:When had you had dinner?
時間狀語: By (the time of)+時間段
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